Multi-channel signal encoding method and encoder

Abstract

A multi-channel signal encoding method and an encoder, where the encoding method includes obtaining a multi-channel signal of a current frame, determining an initial multi-channel parameter of the current frame, determining a difference parameter based on the initial multi-channel parameter of the current frame and multi-channel parameters of previous K frames of the current frame, where the difference parameter represents a difference between the initial multi-channel parameter of the current frame and the multi-channel parameters of the previous K frames, and K is an integer greater than or equal to one, determining a multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame, and encoding the multi-channel signal based on the multi-channel parameter of the current frame. Hence, the method and the encoder ensure better accuracy of inter-channel information of a multi-channel signal.

What is claimed is: 
     
       1. A multi-channel signal encoding method, comprising:
 obtaining a multi-channel signal of a current frame; 
 determining an initial multi-channel parameter of the current frame; 
 determining a difference parameter based on the initial multi-channel parameter of the current frame and multi-channel parameters of previous K frames of the current frame, wherein the difference parameter represents a difference between the initial multi-channel parameter of the current frame and the multi-channel parameters of the previous K frames, and wherein the K is an integer greater than or equal to one; 
 determining a multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and 
 encoding the multi-channel signal of the current frame based on the multi-channel parameter of the current frame. 
 
     
     
       2. The multi-channel signal encoding method of  claim 1 , wherein determining the multi-channel parameter of the current frame comprises determining the multi-channel parameter of the current frame based on the characteristic parameter of the current frame when the difference parameter satisfies a first preset condition. 
     
     
       3. The multi-channel signal encoding method of  claim 2 , wherein the difference parameter is calculated as:
 an absolute value of a difference between the initial multi-channel parameter of the current frame and a multi-channel parameter of a previous frame of the current frame, and the first preset condition comprises that the difference parameter is greater than a preset first threshold; or 
 a product of the initial multi-channel parameter of the current frame and the multi-channel parameter of the previous frame of the current frame, and the first preset condition comprises that the difference parameter is less than or equal to zero. 
 
     
     
       4. The multi-channel signal encoding method of  claim 2 , wherein determining the multi-channel parameter of the current frame comprises determining the multi-channel parameter of the current frame based on a correlation parameter of the current frame, and wherein the correlation parameter represents a degree of correlation between the current frame and a previous frame of the current frame. 
     
     
       5. The multi-channel signal encoding method of  claim 4 , further comprising determining the correlation parameter based on a target channel signal in the multi-channel signal of the current frame and a target channel signal in a multi-channel signal of the previous frame of the current frame. 
     
     
       6. The multi-channel signal encoding method of  claim 5 , wherein determining the correlation parameter comprises determining the correlation parameter based on a frequency domain parameter of the target channel signal in the multi-channel signal of the current frame and a frequency domain parameter of the target channel signal in the multi-channel signal of the previous frame of the current frame, and wherein a frequency domain parameter is at least one of a frequency domain amplitude value or a frequency domain coefficient of a target channel signal. 
     
     
       7. The multi-channel signal encoding method of  claim 4 , further comprising determining the correlation parameter based on a pitch period of the current frame and a pitch period of the previous frame. 
     
     
       8. The multi-channel signal encoding method of  claim 2 , wherein determining the multi-channel parameter of the current frame comprises determining the multi-channel parameter of the current frame based on multi-channel parameters of previous T frames of the current frame when the characteristic parameter of the current frame meets satisfies a second preset condition, and wherein the T is an integer greater than or equal to one. 
     
     
       9. The multi-channel signal encoding method of  claim 8 , wherein determining the multi-channel parameter of the current frame comprises:
 determining the multi-channel parameters of the previous T frames as the multi-channel parameter of the current frame when the T is equal to one; and 
 determining the multi-channel parameter of the current frame based on a change trend of the multi-channel parameters of the previous T frames when the T is greater than or equal to two. 
 
     
     
       10. The multi-channel signal encoding method of  claim 8 , wherein the characteristic parameter of the current frame comprises at least one of a correlation parameter or a peak-to-average ratio parameter of the current frame, wherein the correlation parameter represents a degree of correlation between the current frame and a previous frame of the current frame, wherein the peak-to-average ratio parameter represents a peak-to-average ratio of a signal of at least one channel in the multi-channel signal of the current frame, and wherein the second preset condition is that the characteristic parameter is greater than a preset threshold. 
     
     
       11. An encoder, comprising:
 a memory comprising instructions; and 
 a processor coupled to the memory, wherein the instructions cause the processor to be configured to:
 obtain a multi-channel signal of a current frame; 
 determine an initial multi-channel parameter of the current frame; 
 determine a difference parameter based on the initial multi-channel parameter of the current frame and multi-channel parameters of previous K frames of the current frame, wherein the difference parameter represents a difference between the initial multi-channel parameter of the current frame and the multi-channel parameters of the previous K frames, and wherein the K is an integer greater than or equal to one; 
 determine a multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and 
 encode the multi-channel signal of the current frame based on the multi-channel parameter of the current frame. 
 
 
     
     
       12. The encoder of  claim 11 , wherein the instructions further cause the processor to be configured to determine the multi-channel parameter of the current frame based on the characteristic parameter of the current frame when the difference parameter meets satisfies a first preset condition. 
     
     
       13. The encoder of  claim 12 , wherein the difference parameter is calculated as:
 an absolute value of a difference between the initial multi-channel parameter of the current frame and a multi-channel parameter of a previous frame of the current frame, and the first preset condition comprises that the difference parameter is greater than a preset first threshold; or 
 a product of the initial multi-channel parameter of the current frame and a multi-channel parameter of a previous frame of the current frame, and the first preset condition comprises that the difference parameter is less than or equal to zero. 
 
     
     
       14. The encoder of  claim 12 , wherein the instructions further cause the processor to be configured to determine the multi-channel parameter of the current frame based on a correlation parameter of the current frame, and wherein the correlation parameter represents a degree of correlation between the current frame and a previous frame of the current frame. 
     
     
       15. The encoder of  claim 14 , wherein the instructions further cause the processor to be configured to determine the correlation parameter based on a target channel signal in the multi-channel signal of the current frame and a target channel signal in a multi-channel signal of the previous frame of the current frame. 
     
     
       16. The encoder of  claim 15 , wherein the instructions further cause the processor to be configured to determine the correlation parameter based on a frequency domain parameter of the target channel signal in the multi-channel signal of the current frame and a frequency domain parameter of the target channel signal in the multi-channel signal of the previous frame, and wherein a frequency domain parameter is at least one of a frequency domain amplitude value or a frequency domain coefficient of a target channel signal. 
     
     
       17. The encoder of  claim 14 , wherein the instructions further cause the processor to be configured to determine the correlation parameter based on a pitch period of the current frame and a pitch period of the previous frame of the current frame. 
     
     
       18. The encoder of  claim 12 , wherein the instructions further cause the processor to be configured to determine the multi-channel parameter of the current frame based on multi-channel parameters of previous T frames of the current frame when the characteristic parameter satisfies a second preset condition, and wherein the T is an integer greater than or equal to one. 
     
     
       19. The encoder of  claim 18 , wherein the instructions further cause the processor to be configured to:
 determine the multi-channel parameters of the previous T frames as the multi-channel parameter of the current frame when the T is equal to one; and 
 determine the multi-channel parameter of the current frame based on a change trend of the multi-channel parameters of the previous T frames when the T is greater than or equal to two. 
 
     
     
       20. The encoder of  claim 18 , wherein the characteristic parameter comprises at least one of a correlation parameter or a peak-to-average ratio parameter of the current frame, wherein the correlation parameter represents a degree of correlation between the current frame and a previous frame of the current frame, wherein the peak-to-average ratio parameter represents a peak-to-average ratio of a signal of at least one channel in the multi-channel signal of the current frame, and wherein the second preset condition is that the characteristic parameter is greater than a preset threshold.